Here you can find the source of sleep(final long milliseconds)
public static boolean sleep(final long milliseconds)
//package com.java2s; /*//from www .j a va2 s.com * Copyright 2010-2016 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ public class Main { public static boolean sleep(final long milliseconds) { try { Thread.sleep(milliseconds); return true; } catch (InterruptedException ignore) { return false; } } }